By
D. J. Barker, BSc, MD, PhD, FRCP, FRCOG, FFPHM, Director and Professor of Clinical Epidemiology, Medical Research Council Environmental Epidemiology
Unit, Uinversity of Southampton; Honorary Consultant Physician, Southampton University Hospitals Trust, UK
Cyrus Cooper, MA, DM, FRCP, FMedSci, Director and Professor of Rheumatology, Southampton General Hospital, Southampton, UK
G. Rose, MA, DM, DSc, FRCP, FRCGP, Late Professor of Epidemiology, London School of Hygiene and Tropical Medicine